They planted some of these in the landscaping around my local Walmart which is about 2 miles from my house. Thought they look like oleander to me. Unless there is a hardier variety that I don't know about, they won't survive our winter outside in the ground. Guess that's why I am questioning what this plant is.
Doesn't look like it,.....click this link to see photos on our plant data base. Nerium oleander (Oleander)